some lint cleanup

some lint cleanup

     Using
	gcc -Wall -Wshadow -Wpointer-arith -Wwrite-strings \
	    -Wmissing-braces -Wmissing-prototypes
with an old version of gcc.

mhitu.c: In function `hitmu':
mhitu.c:1176: warning: declaration of `buf' shadows previous local
options.c: In function `special_handling':
options.c:2712: warning: initialization discards `const' from pointer target type
options.c:2745: warning: initialization discards `const' from pointer target typ
trap.c: In function `dotrap':
trap.c:1111: warning: `saddle' might be used uninitialized in this function

The first one is no longer present in the trunk code.  The last one is
bogus as its wishy-washy wording suggests.